Synthesis and biological activity of 13-epi-avermectins: potent anthelmintic agents with an increased margin of safety

Abstract
Chemical conversion of the potent anthelmintic natural products avermectin B1 (1) and avermectin B2 (3) to the corresponding 13-epi analogs (15 and 9) is described. The novel analogs retain the full potency of the natural products but are substantially safer.

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